I could tell he was surprised from the _____ on his face.

（ ） some mammals came to live in the sea is now known.

Don’t talk about such things of （ ） you are not sure.

Please sit down and make yourself （ ）.

Hardly （ ） how I passed the interview.

They go to work every day （ ） Saturday and Sunday. Those days are holidays.

It was not known （ ） he had said during the interview.

As a matter of fact, they would rather leave for Beijing than _____ in Shanghai.

I recognized John （ ） he entered the room.

（ ） I fixed the plug properly, I still got an electric shock.

I have two children but （ ） of them likes fruits.

It was in Johnson’s hotel （ ） the business meeting was held last year.